racket/collects/redex/examples/cont-mark-transform/SL-syntax.rkt

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#lang racket
(require "TL-syntax.rkt"
redex)
(provide SL no-dup-keys)
(define-extended-language SL TL
(e ....
(call/cc w))
(v ....
(κ (hide-hole E)))
(D (w-c-m v v D)
hole
(v ... D))
(E (side-condition D_1 (term (no-dup-keys D_1 ()))))
; used in the marks collapsing rule (6)
(C (w-c-m v v C)
hole)
; used in translation
(r (a ...)
(letrec ([σ w] ...) e)
(w-c-m a a a)
(c-c-m [a ...])
(match a l ...)
(abort e)
(call/cc e))
(T (w-c-m a a T)
hole
(a ... T))
(k v
#f))
(define-metafunction SL
[(no-dup-keys hole (v ...))
#t]
[(no-dup-keys (w-c-m v_i v D) (v_0 ... v_i v_i+1 ...))
#f]
[(no-dup-keys (w-c-m v_i v D) (v_0 ...))
(no-dup-keys D (v_i v_0 ...))]
[(no-dup-keys (v ... D) (v_0 ...))
(no-dup-keys D ())])